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| · Looking at the Gibbs function of the system (a + q) gives additional insight into the reason for the transitions from GP -> q" -> q' -> q that take place in the isothermal transformation processes. The mean composition of the alloy is a0, and it can separate into two equilibrium components ai and q j that have the same chemical potential. The diagram shows that the Gibbs function of the system is reduced as the above transition sequence is followed. | ||||||